allow preinit scripts to place signal files (#326)

bitnami/postgresql/14/debian-10/rootfs/opt/bitnami/scripts/libpostgresql.sh

@@ -567,8 +567,6 @@ postgresql_clean_from_restart() {
 #########################
 postgresql_initialize() {
     info "Initializing PostgreSQL database..."
-    postgresql_clean_from_restart
-
     # This fixes an issue where the trap would kill the entrypoint.sh, if a PID was left over from a previous run
     # Exec replaces the process without creating a new one, and when the container is restarted it may have the same PID
     rm -f "$POSTGRESQL_PID_FILE"

bitnami/postgresql/14/debian-10/rootfs/opt/bitnami/scripts/postgresql/setup.sh

@@ -25,6 +25,8 @@ trap "postgresql_stop" EXIT
 am_i_root && ensure_user_exists "$POSTGRESQL_DAEMON_USER" --group "$POSTGRESQL_DAEMON_GROUP"
 # Fix logging issue when running as root
 am_i_root && chmod o+w "$(readlink /dev/stdout)"
+# Remove flags and postmaster files from a previous run
+postgresql_clean_from_restart
 # Allow running custom pre-initialization scripts
 postgresql_custom_pre_init_scripts
 # Ensure PostgreSQL is initialized